Convert image

No. The file is decoded and re-encoded inside a Web Worker in this tab. JPG, PNG, WebP, AVIF and JXL run on the jSquash WebAssembly codecs, mozjpeg and libwebp among them; libheif reads HEIC, utif2 reads and writes TIFF, ag-psd handles PSD, gifenc quantises GIF, and BMP and ICO are written by code in this repo. Nothing leaves your device, there is no account, and the page keeps working with your network switched off after the first visit.

Ten in and ten out, and they are not the same ten. Readable: JPG, PNG, WebP, AVIF, JXL, HEIC, TIFF, PSD, GIF and BMP. Writable: the same list with HEIC swapped for ICO, because no wasm HEIC encoder exists anywhere and reading an ICO directory was never worth building. The input format is read from the file name, not the bytes, so the extension has to match. SVG is not read here; Rasterize SVG to PNG does that. The Output format option defaults to webp.

It depends on the target format. JPG, WebP, AVIF and JXL are lossy, and the Quality option (1 to 100, default 80) decides how much detail survives. The other targets ignore quality, though GIF still reduces the picture to 256 colours. Converting a JPG to PNG does not bring back detail the JPG already threw away; it only stops further loss. A quality outside the range is refused with "quality must be a number between 1 and 100".

Your original name with the extension swapped: holiday.png comes back as holiday.webp. The jpeg format is written with a .jpg extension. This tool takes as many files as you drop, and each one is converted on its own and comes back as its own download, so twenty files in means twenty files out.

No. Conversion decodes to raw pixels and encodes those pixels again, so EXIF, GPS, IPTC, XMP and any embedded colour profile do not survive. That is a side effect of the round trip rather than the point of the tool. If removing metadata is what you want, use Remove image metadata, which keeps the format. To read what a photo carries first, use View EXIF data.

Convert image changes the format and lets you choose it. Compress image keeps whatever format the file already had and re-encodes it smaller, at a default quality of 70, with a -min suffix on the name. If you want a smaller JPG, compress it. If you want that JPG to become WebP, convert it.